Glass bead

Opaque black glass spindle-whorl or bead, diam. 3.2cm. Flat underside, curved upper surface, with hole made by glass-maker. Marvered trail decoration on upper surface: broad yellow-green trail around basal circumference, and another around the hole. In between these bands, which are broad, narrower clear yellow trailing in dense zig-zags.No provenance given, no details. Very possibly from Sibertswold because very like others from this cemetery, Gr. 172??